The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_watchdog.c

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    1 /*      $OpenBSD: kern_watchdog.c,v 1.16 2022/08/14 01:58:27 jsg Exp $        */
    2 
    3 /*
    4  * Copyright (c) 2003 Markus Friedl.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 #include <sys/param.h>
   27 #include <sys/systm.h>
   28 #include <sys/timeout.h>
   29 #include <sys/sysctl.h>
   30 
   31 void    wdog_tickle(void *arg);
   32 int     (*wdog_ctl_cb)(void *, int) = NULL;
   33 void    *wdog_ctl_cb_arg = NULL;
   34 int     wdog_period = 0;
   35 int     wdog_auto = 1;
   36 struct  timeout wdog_timeout;
   37 
   38 void
   39 wdog_register(int (*cb)(void *, int), void *cb_arg)
   40 {
   41         if (wdog_ctl_cb != NULL)
   42                 return;
   43 
   44         wdog_ctl_cb = cb;
   45         wdog_ctl_cb_arg = cb_arg;
   46         timeout_set(&wdog_timeout, wdog_tickle, NULL);
   47 }
   48 
   49 void
   50 wdog_tickle(void *arg)
   51 {
   52         if (wdog_ctl_cb == NULL)
   53                 return;
   54         (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
   55         timeout_add_msec(&wdog_timeout, wdog_period * 1000 / 2);
   56 }
   57 
   58 void
   59 wdog_shutdown(void *arg)
   60 {
   61         if (wdog_ctl_cb == NULL || wdog_ctl_cb_arg != arg)
   62                 return;
   63         timeout_del(&wdog_timeout);
   64         (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, 0);
   65         wdog_ctl_cb = NULL;
   66         wdog_period = 0;
   67         wdog_auto = 1;
   68 }
   69 
   70 int
   71 sysctl_wdog(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
   72     size_t newlen)
   73 {
   74         int error, period;
   75 
   76         if (wdog_ctl_cb == NULL)
   77                 return (EOPNOTSUPP);
   78 
   79         switch (name[0]) {
   80         case KERN_WATCHDOG_PERIOD:
   81                 period = wdog_period;
   82                 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen,
   83                     &period, 0, INT_MAX);
   84                 if (error)
   85                         return (error);
   86                 if (newp) {
   87                         timeout_del(&wdog_timeout);
   88                         wdog_period = (*wdog_ctl_cb)(wdog_ctl_cb_arg, period);
   89                 }
   90                 break;
   91         case KERN_WATCHDOG_AUTO:
   92                 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen,
   93                     &wdog_auto, 0, 1);
   94                 if (error)
   95                         return (error);
   96                 break;
   97         default:
   98                 return (EINVAL);
   99         }
  100 
  101         if (wdog_auto && wdog_period > 0) {
  102                 (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
  103                 timeout_add_msec(&wdog_timeout, wdog_period * 1000 / 2);
  104         } else
  105                 timeout_del(&wdog_timeout);
  106 
  107         return (error);
  108 }

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